Comment 39 for bug 742544

I was really hoping Andrea just made a mistake and was meaning to say that the launcher was going to be displayed on the monitor on the right. Based on Kim's response it appears not to be the case and i'm quite surprised to hear this. It might be the implemented behaviour now, it's definitely not the wanted or desired behaviour.

People set a monitor as primary for a reason: to use it as the primary one. That's were you want your primary actions and work to take place, that's were you have your main attention on, your main workarea. This definitely includes the launcher as well. Now you'd constantly have to divert your attention by moving all the way to the left of your left screen to get to the launcher. A non-primary might not even turned on all the time.

Primary GUI items should be on the monitor the user considers the primary, no matter its position.